What is a GP30M Diode? - UK Vintage Radio Repair and Restoration Discussion Forum

'LIVEWIRE?' · 18th Aug 2018, 9:31 pm

Looking through a bag of assorted components, I came across a packet of diodes bearing the above type number stamped on them- the full number being GP30MG185. These are DO-201 encapsulation i.e. the same size as 1N540x series, but googling either the short or full number produces no results. Not being able to remember when, or from where I bought them (There is no suppliers label on the package, though there may once have been a card stapled to it) I have no idea what, other than diodes, they are. Can anyone shed any light, please? I was hoping to use them as rectifiers, in particular in a mod. to the PSU circuit of a Marshall JTM45 amplifier, the subject of another thread.
I also found a single IV5KE200A (CPC SC07285) diode, and have no data for that, either!

Boater Sam · 18th Aug 2018, 9:50 pm

Si or Ge? Measure the forward voltage drop.
Most likely Si if they are DO-201 package.

buggies · 18th Aug 2018, 10:03 pm

Dunno about the G185 bit but GP30M is listed on the datasheet here as 3A 1000V:-
https://pdf1.alldatasheet.com/datash...6/GE/GP30.html
Note that the site does not like direct entry to the data so there will be a message and another target to click...

sortedradio · 18th Aug 2018, 10:17 pm

https://www.vishay.com/doc?88640

'LIVEWIRE?' · 19th Aug 2018, 8:57 am

Thanks, Sam, George, & Martin. How did I miss those data sheets?? I've use 'alldatasheet.com' before, so i know what that site is like. Anyway, from the info. on those pages, it seems that the GP30M is a 1000VRRM diode, similar to a 1N5408, so could be used for the PSU mod. I mentioned. They are silicon, glass passivated types (another term i don't fully understand, b.t.w).

Maarten · 19th Aug 2018, 10:57 pm

Not that similar to the 1N5408. Basically there's 3 common types/categories of 1000V 3A diodes that aren't always interchangeable. The 1N5408 is a slow 120Hz recifier. The GP30M is medium fast. The UF5408 is very fast. You can always use a faster type in a slower application, but not the other way around.

McMurdo · 19th Aug 2018, 11:05 pm

the cpc diode is a TVS (transient voltage suppressor), a sort of fancy zener diode for over voltage protection.

If you type that CPC number into the CPC website, they have a downloadable datasheet.

Note the diode starts 1V... not IV...

18th Aug 2018, 9:31 pm	#1
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	What is a GP30M Diode? Looking through a bag of assorted components, I came across a packet of diodes bearing the above type number stamped on them- the full number being GP30MG185. These are DO-201 encapsulation i.e. the same size as 1N540x series, but googling either the short or full number produces no results. Not being able to remember when, or from where I bought them (There is no suppliers label on the package, though there may once have been a card stapled to it) I have no idea what, other than diodes, they are. Can anyone shed any light, please? I was hoping to use them as rectifiers, in particular in a mod. to the PSU circuit of a Marshall JTM45 amplifier, the subject of another thread. I also found a single IV5KE200A (CPC SC07285) diode, and have no data for that, either!

18th Aug 2018, 9:50 pm	#2
Boater Sam Banned Join Date: Dec 2013 Location: Middlewich, Cheshire, UK. & Winter in the Philippines. Posts: 3,897	Re: What is a GP30M Diode? Si or Ge? Measure the forward voltage drop. Most likely Si if they are DO-201 package.

18th Aug 2018, 10:03 pm	#3
buggies Heptode Join Date: Jan 2009 Location: West Lothian, UK. Posts: 761	Re: What is a GP30M Diode? Dunno about the G185 bit but GP30M is listed on the datasheet here as 3A 1000V:- https://pdf1.alldatasheet.com/datash...6/GE/GP30.html Note that the site does not like direct entry to the data so there will be a message and another target to click... __________________ George

18th Aug 2018, 10:17 pm	#4
sortedradio Heptode Join Date: Jan 2008 Location: Sheffield, South Yorkshire, UK. Posts: 655	Re: What is a GP30M Diode? https://www.vishay.com/doc?88640 __________________ Martin BVWS member GQRP Club

19th Aug 2018, 8:57 am	#5
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: What is a GP30M Diode? Thanks, Sam, George, & Martin. How did I miss those data sheets?? I've use 'alldatasheet.com' before, so i know what that site is like. Anyway, from the info. on those pages, it seems that the GP30M is a 1000VRRM diode, similar to a 1N5408, so could be used for the PSU mod. I mentioned. They are silicon, glass passivated types (another term i don't fully understand, b.t.w).

19th Aug 2018, 10:57 pm	#6
Maarten Dekatron Join Date: Dec 2007 Location: Haarlem, Netherlands Posts: 4,199	Re: What is a GP30M Diode? Not that similar to the 1N5408. Basically there's 3 common types/categories of 1000V 3A diodes that aren't always interchangeable. The 1N5408 is a slow 120Hz recifier. The GP30M is medium fast. The UF5408 is very fast. You can always use a faster type in a slower application, but not the other way around.

19th Aug 2018, 11:05 pm	#7
McMurdo Dekatron Join Date: Jun 2009 Location: Staffordshire Moorlands, UK. Posts: 5,271	Re: What is a GP30M Diode? the cpc diode is a TVS (transient voltage suppressor), a sort of fancy zener diode for over voltage protection. If you type that CPC number into the CPC website, they have a downloadable datasheet. Note the diode starts 1V... not IV... __________________ Kevin